7.6 Transitions
A transition is technically a two-input effect where the time intervals of the two inputs overlap partially. There is no special notation for transitions in muSE. You use the same (effect ....) expression but provide as an input pattern a list of two symbols.
For example -
(effect "CrossFade" (A B))
is a transition.
The special variable muvee-transition, when defined to a valid transition, serves as the specification of transitions from one segment to the next within a muvee.